Chevrolet 2003 Impala Owner's Manual page 189

Setting the Tone (Bass/Treble)
AUDIO: Push and release the AUDIO knob until BASS
or TREB appears on the display. Turn the knob to
increase or to decrease. The display will show the bass
or the treble level. If a station is weak or noisy, you
may want to decrease the treble.
To adjust the bass and the treble to the middle position,
push and hold the AUDIO knob. The radio will produce
one beep and adjust the display level to the
middle position.
To adjust all tone and speaker controls to the middle
position, push and hold the AUDIO knob when no tone
or speaker control is displayed. You will hear one
beep and the radio will display ALL. The bass and the
treble will be adjusted to the middle position.
AUTO TONE (Automatic Tone): Press this button to
choose bass and treble equalization settings designed
for country/western, jazz, talk, pop, rock, and classical
stations.
To return the bass and treble to the manual mode,
push and release the AUDIO knob until MANUAL
is displayed.
Adjusting the Speakers (Balance/Fade)
AUDIO: To adjust the balance between the right
and the left speakers, push and release the AUDIO
knob until BAL appears on the display. Turn the knob to
move the sound toward the right or the left speakers.
To adjust the fade, push and release the AUDIO
knob until FADE appears on the display. Turn the
knob to move the sound toward the front or the
rear speakers.
To adjust the balance and the fade to the middle
position, push the AUDIO knob, then push it again and
hold it until you hear one beep. The balance and the
fade will be adjusted to the middle position and the
display will show the speaker balance.
To adjust all tone and speaker controls to the middle
position, push and hold the AUDIO knob when no tone
or speaker control is displayed. The radio will produce
one beep and display ALL with the level display in
the middle position.
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